All Things Mk5 > Performance Modifications
Brake Ducts
rex:
Yup, I guess you summarized it correctly!
I already bought a new dust shield... It will arrive tomorrow... It was about 10 EURO (~8 GBP) and I had 50% discount so it was not worth to get it from other places... Thanks for the thought, though!
I will have it fitted tomorrow and see how it goes from there on.
OFFTOPIC.
Yes, I told fuscobal to keep the templates so it will be easier to have a wing mounted later on.
I also want to have a rear diffuser but this is a costly job since I want to change the whole exhaust with the new diffuser.
But both these chapters require spending money and I prefer to spend the money on going to Hungaroring and/or Nurburgring instead. There is enough time to do all the mods...
So, since the finances are limited I want to do these brake vents and also a baffled sump.
fuscobal:
Very nice topic Rex. I see 2 problems there :
1) There will be like 2 shims (plates) in the front grille right in front of the entrance to the duct. I don't know what they'll do to the air entering the duct (regarding speed and turbulence)
2) Having the diameter of the duct shrink just before the exit to the disc will accelerate air while the exact opposite should be done (at least that's how it works for the radiators). Don't know how this will interact with the disc's rotation and the cooling vanes. For a radiator, you'd want the air to slow down before hiting it. In Simon McBeath's book there were some comparisons with various guides in front of the radiators if I recall correctly ! Can't you try to make an ovaloid section there (like 2cm high and 10cm long or whatever gives an area larger than your 5cm diameter duct). Ap said "A typical venting cross section of 100cm² (16in²) is usually sufficient. The pick up should preferably be in an area of clean high pressure air flow and the ducting should be arranged to avoid sharp bends or changes in section which may choke the air flow". High pressure airflow equals low speed, meaning you'll have to enlarge the exit, not shrink it. Going even further, 100cm² is way more than what your 5cm duct gives you (19.6cm²)
If I were you, I'd use the brakes as they are but without the shields (my APs are not that dirty and remember I have no seals on my calipers) and I'd upgrade to some medium brake kit like 4 pots with 320-330mm sometime when possible !
rex:
Thank you for your thoughts, fuscobal :notworthy: !
Well, those 2 points are problems only if the goal is to create the perfect brake ducts performance wise! So, great advice for anyone who will build some brake vents and want maximum performance!
But, I am aware that I want to make some esthetic and daily drive mods...
So those 2 problems are not quite problems as far as I am concern:
1. Yes, those 2 plates might affect the air flow but I also want my car to look OEM (OEMish) and nice. So they will stay on...
2. With the OEM 312mm discs there is not enough room to expend the exit. Restricting the air flow was done only because I had to redirect the air towards the disc bell (hub). If I had had enough space to make another exit I would have done it. For larger diameter rotors (like yours) the exist can be made differently (with a larger exit)....
the bruce:
--- Quote from: fuscobal on February 21, 2013, 11:27:16 pm ---If I were you, I'd use the brakes as they are but without the shields (my APs are not that dirty and remember I have no seals on my calipers)....
--- End quote ---
Vlad, you see we won't stop forcing you to discard them. :evilgrin:
Your brakes will welcome the absence of these needless shields.*
:drinking:
* of course in this specific case you'd best cut them to a minimum able to provide fitment of the ducts
rex:
:grin: We have a saying: "When everybody says you're drunk, it's time to go to bed" :grin: (since everybody is telling me to drop the dust shields :scared:)
I will install the shields for the template (Saturday or Sunday) and see how it goes from there on...
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